package com.csu.authserver.controller;

import com.alibaba.fastjson.TypeReference;
import com.csu.authserver.feign.MemberFeignService;
import com.csu.authserver.feign.ThirdPartFeignService;
import com.csu.authserver.vo.UserLoginVo;
import com.csu.authserver.vo.UserRegistVo;
import com.csu.mall.common.Global;
import com.csu.mall.common.utils.R;
import org.apache.commons.lang.StringUtils;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Controller;
import org.springframework.validation.BindingResult;
import org.springframework.validation.FieldError;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;
import javax.validation.Valid;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

@Controller
public class LoginController {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Resource
    private ThirdPartFeignService thirdPartFeignService;

    @Resource
    private MemberFeignService memberFeignService;
    /**
     * 获取短信验证码
     * @param phone
     * @return
     */
    @ResponseBody
    @GetMapping("/sms/sendcode")
    public R sendCode(@RequestParam("phone") String phone){

        //TODO 1、接口防刷。
        String redisCode = stringRedisTemplate.opsForValue().get(Global.AuthServerConstant.SMS_CODE_CACHE_PREFIX + phone);
        if(!StringUtils.isEmpty(redisCode)){
            long l = Long.parseLong(redisCode.split("_")[1]);
            if(System.currentTimeMillis() - l < 60000){
                //60秒内不能再发 (防止操作人员刷新注册页面，重复点击【发送验证码】)
                return R.error(Global.BizCodeEnum.SMS_CODE_EXCEPTION.getCode(),Global.BizCodeEnum.SMS_CODE_EXCEPTION.getMessage());
            }
        }


        //2、验证码的再次校验。redis。存key(phone)-value(code)   sms:code:17512080612 -> 45678
        String code = UUID.randomUUID().toString().substring(0, 5);
        //key后缀加上系统时间，用来判断当前系统时间和上次获取验证码的时间是否超过60秒
        String substring = code+"_"+System.currentTimeMillis();
        //redis缓存验证码，防止同一个phone在60秒内再次发送验证码

        //验证10分钟后过期，需要设置key-value的存活时间
        stringRedisTemplate.opsForValue().set(Global.AuthServerConstant.SMS_CODE_CACHE_PREFIX+phone,substring,10, TimeUnit.MINUTES);

        thirdPartFeignService.sendCode(phone,code);
        return R.ok();
    }

    /**
     *
     *   //TODO 重定向携带数据，利用session原理。将数据放在session中。
     *     只要跳到下一个页面取出这个数据以后，session里面的数据就会删掉
     *
     *  //TODO 1、分布式下的session问题。
     * RedirectAttributes redirectAttributes：模拟重定向携带数据
     * @param vo
     * @param result
     * @param redirectAttributes
     * @return
     */
    @PostMapping("/regist")
    public String regist(@Valid UserRegistVo vo, BindingResult result,
                         RedirectAttributes redirectAttributes,
                         HttpSession session){
        if(result.hasErrors()){
            Map<String, String> errors = result.getFieldErrors().stream().collect(Collectors.toMap(FieldError::getField, FieldError::getDefaultMessage));
//            model.addAttribute("errors",errors);
            redirectAttributes.addFlashAttribute("errors",errors);


            //校验出错，重定向到注册页
            return "redirect:http://auth.csuonlinemall.com/reg.html";
        }
        //校验验证码
        String code = vo.getCode();

        String s = stringRedisTemplate.opsForValue().get(Global.AuthServerConstant.SMS_CODE_CACHE_PREFIX + vo.getPhone());
        if(!StringUtils.isEmpty(s)){
            if(code.equals(s.split("_")[0])){
                //删除验证码;令牌机制(用完就删)
                stringRedisTemplate.delete(Global.AuthServerConstant.SMS_CODE_CACHE_PREFIX + vo.getPhone());
                //验证码通过。 //真正注册。调用远程服务进行注册
                R r = memberFeignService.regist(vo);
                if(r.getCode() == 0){
                    //成功

                    return "redirect:http://auth.csuonlinemall.com/login.html";
                }else{
                    Map<String, String> errors = new HashMap<>();
                    errors.put("msg",(String) r.get("msg"));
                    redirectAttributes.addFlashAttribute("errors",errors);
                    return "redirect:http://auth.csuonlinemall.com/reg.html";
                }

            }else{
                Map<String, String> errors =  new HashMap<>();
                errors.put("code","验证码错误");
                redirectAttributes.addFlashAttribute("errors",errors);
                return "redirect:http://auth.csuonlinemall.com/reg.html";
            }
        }else {
            Map<String, String> errors =  new HashMap<>();
            errors.put("code","验证码错误");
            redirectAttributes.addFlashAttribute("errors",errors);
            //校验出错，转发到注册页
            return "redirect:http://auth.csuonlinemall.com/reg.html";
        }
    }

    //前端传的数据格式不是json,是表单的k-v。直接接收，不用使用@RequestBody注解
    @PostMapping("/login")
    public String login(UserLoginVo userLoginVo, RedirectAttributes redirectAttributes){
        R login = memberFeignService.login(userLoginVo);
        if(login != null && login.getCode() == 0){
            return "redirect:http://csuonlinemall.com";
        }else{
            Map<String, String> errors = new HashMap<>();
            errors.put("msg", (String) login.get("msg"));
            redirectAttributes.addFlashAttribute("errors", errors);
            return "redirect:http://auth.csuonlinemall.com/login.html";
        }
    }
}
